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  1. Article: Fast and dark: The case of Mezquite lizards at extreme altitude

    González-Morales, Juan Carlos / Rivera-Rea, Jimena / Moreno-Rueda, Gregorio / Bastiaans, Elizabeth / Castro-López, Meily / Fajardo, Víctor

    Journal of thermal biology. 2021 Dec., v. 102

    2021  

    Abstract: Sprint speed is a major performance trait in animal fitness involved in escaping from predators, obtaining food, and defending territory. Biotic and abiotic factors may influence sprint speed in lizards. Temperature decreases at higher altitude. ... ...

    Abstract Sprint speed is a major performance trait in animal fitness involved in escaping from predators, obtaining food, and defending territory. Biotic and abiotic factors may influence sprint speed in lizards. Temperature decreases at higher altitude. Therefore, lizards at high elevations may require longer basking times to reach optimal body temperatures, increasing their vulnerability to predation and decreasing their time for other activities such as foraging or reproduction. Here, we tested whether the maximum sprint speed of a lizard that shows conservative thermal ecology varied along an altitudinal gradient comprising low (2500 m), middle (3400 m) and high-altitude (4300 m) populations. We also tested whether sprint speed was related to dorsal reflectance at different ecologically relevant temperatures. Given that the lizard Sceloporus grammicus shows conservative thermal ecology with altitude, we expected that overall average sprint speed would not vary with altitude. However, given that darker lizards heat up quicker, we expected that darker lizards would be faster than lighter lizards. Our results suggest that S. grammicus at high altitude are faster and darker at 30 °C, while lizards from low and middle altitude are faster and lighter in color at 20 °C than high altitude lizards. Also, our results suggest a positive relationship between sprint speed and dorsal skin reflectance at 10 and 20 °C. Sprint speed was also affected by snout-vent length, leg length, and leg thickness at 10 °C. These results suggest that, even though predation pressure is lower at extreme altitudes, other factors such as vegetation cover or foraging mode have influenced sprint speed.
    Keywords Sceloporus ; altitude ; color ; heat ; lizards ; predation ; reflectance ; reproduction ; vegetation cover
    Language English
    Dates of publication 2021-12
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1498364-3
    ISSN 1879-0992 ; 0306-4565
    ISSN (online) 1879-0992
    ISSN 0306-4565
    DOI 10.1016/j.jtherbio.2021.103115
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Functional outcome after hand replantation in Guatemala.

    Romero-Prieto, Fernando / González-Morales, Juan Carlos

    Journal of surgical case reports

    2017  Volume 2017, Issue 12, Page(s) rjx243

    Abstract: Amputations of a traumatic origin are very frequent in developing countries, in the case of Guatemala these are a result of work accidents very closely related to poor work conditions existing for manual workers, as well as social violence and the lack ... ...

    Abstract Amputations of a traumatic origin are very frequent in developing countries, in the case of Guatemala these are a result of work accidents very closely related to poor work conditions existing for manual workers, as well as social violence and the lack of security that governs society. The present case shows a patient that suffered a left hand amputation at wrist level. Amputated hand was transported swiftly and in adequate conditions, maintaining cold chain at all times until arrival at Hospital for replantation. After 14 months, patient has evolved satisfactorily and obtained functional result of the hand.
    Language English
    Publishing date 2017-12-11
    Publishing country England
    Document type Case Reports
    ISSN 2042-8812
    ISSN 2042-8812
    DOI 10.1093/jscr/rjx243
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Fast and dark: The case of Mezquite lizards at extreme altitude.

    González-Morales, Juan Carlos / Rivera-Rea, Jimena / Moreno-Rueda, Gregorio / Bastiaans, Elizabeth / Castro-López, Meily / Fajardo, Víctor

    Journal of thermal biology

    2021  Volume 102, Page(s) 103115

    Abstract: Sprint speed is a major performance trait in animal fitness involved in escaping from predators, obtaining food, and defending territory. Biotic and abiotic factors may influence sprint speed in lizards. Temperature decreases at higher altitude. ... ...

    Abstract Sprint speed is a major performance trait in animal fitness involved in escaping from predators, obtaining food, and defending territory. Biotic and abiotic factors may influence sprint speed in lizards. Temperature decreases at higher altitude. Therefore, lizards at high elevations may require longer basking times to reach optimal body temperatures, increasing their vulnerability to predation and decreasing their time for other activities such as foraging or reproduction. Here, we tested whether the maximum sprint speed of a lizard that shows conservative thermal ecology varied along an altitudinal gradient comprising low (2500 m), middle (3400 m) and high-altitude (4300 m) populations. We also tested whether sprint speed was related to dorsal reflectance at different ecologically relevant temperatures. Given that the lizard Sceloporus grammicus shows conservative thermal ecology with altitude, we expected that overall average sprint speed would not vary with altitude. However, given that darker lizards heat up quicker, we expected that darker lizards would be faster than lighter lizards. Our results suggest that S. grammicus at high altitude are faster and darker at 30 °C, while lizards from low and middle altitude are faster and lighter in color at 20 °C than high altitude lizards. Also, our results suggest a positive relationship between sprint speed and dorsal skin reflectance at 10 and 20 °C. Sprint speed was also affected by snout-vent length, leg length, and leg thickness at 10 °C. These results suggest that, even though predation pressure is lower at extreme altitudes, other factors such as vegetation cover or foraging mode have influenced sprint speed.
    MeSH term(s) Altitude ; Animals ; Body Temperature/physiology ; Body Temperature Regulation/physiology ; Cold Temperature ; Ecology ; Ecosystem ; Female ; Gravidity ; Lizards/physiology ; Male ; Motor Activity/physiology ; Reproduction/physiology ; Running/physiology ; Sex Characteristics
    Language English
    Publishing date 2021-11-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 1498364-3
    ISSN 1879-0992 ; 0306-4565
    ISSN (online) 1879-0992
    ISSN 0306-4565
    DOI 10.1016/j.jtherbio.2021.103115
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  4. Article ; Online: A Mountain or a Plateau? Hematological Traits Vary Nonlinearly with Altitude in a Highland Lizard.

    González-Morales, Juan Carlos / Beamonte-Barrientos, Rene / Bastiaans, Elizabeth / Guevara-Fiore, Palestina / Quintana, Erendira / Fajardo, Victor

    Physiological and biochemical zoology : PBZ

    2017  Volume 90, Issue 6, Page(s) 638–645

    Abstract: High-altitude organisms exhibit hematological adaptations to augment blood transport of oxygen. One common mechanism is through increased values of blood traits such as erythrocyte count, hematocrit, and hemoglobin concentration. However, a positive ... ...

    Abstract High-altitude organisms exhibit hematological adaptations to augment blood transport of oxygen. One common mechanism is through increased values of blood traits such as erythrocyte count, hematocrit, and hemoglobin concentration. However, a positive relationship between altitude and blood traits is not observed in all high-altitude systems. To understand how organisms adapt to high altitudes, it is important to document physiological patterns related to hypoxia gradients from a greater variety of species. Here, we present an extensive hematological description for three populations of Sceloporus grammicus living at 2,500, 3,400, and 4,300 m. We did not find a linear increase with altitude for any of the blood traits we measured. Instead, we found nonlinear relationships between altitude and the blood traits erythrocyte number, erythrocyte size, hematocrit, and hemoglobin concentration. Erythrocyte number and hematocrit leveled off as altitude increased, whereas hemoglobin concentration and erythrocyte size were highest at intermediate altitude. Additionally, lizards from our three study populations are similar in blood pH, serum electrolytes, glucose, and lactate. Given that the highest-altitude population did not show the highest levels of the variables we measured, we suggest these lizards may be using different adaptations to cope with hypoxia than lizards at low or intermediate altitudes. We discuss future directions that research could take to investigate such potential adaptations.
    MeSH term(s) Adaptation, Physiological ; Altitude ; Animals ; Cell Size ; Erythrocyte Count/veterinary ; Erythrocyte Indices ; Erythrocytes/cytology ; Hematocrit/veterinary ; Hemoglobins/physiology ; Lizards/blood ; Lizards/physiology ; Oxygen/blood
    Chemical Substances Hemoglobins ; Oxygen (S88TT14065)
    Language English
    Publishing date 2017-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1473845-4
    ISSN 1537-5293 ; 1522-2152
    ISSN (online) 1537-5293
    ISSN 1522-2152
    DOI 10.1086/694833
    Database MEDical Literature Analysis and Retrieval System OnLINE

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